chairman of the house homeland security committee, republican congressman michael mcfall, was on with erin burnett tonight. as he was leaving the set, he told me these appear to be ied-like devices but also cautioned, saying they don't have, based on his intelligence briefings so far, they don't have specific information. ied conjures up images you're all too familiar with. i know dr. gupta is as well, of explosives used in iraq and afghanistan. sadly, in this internet age, you can go online and get advice and tips and even a plan on how to make these devices. but the ball bearings, that type of a shrapnel explosive device, crude or otherwise, is designed to impact as much possible harm. by crude and unsophisticated, these sources are not saying not deadly and obviously not harmful. you see the injuries. but if you look at the pictures, including these pictures right here, what the people analyzing them are judging, and the reason they say these are crude and unsophisticated is that people not all that far away from the explosion either did not have concussive impact or did not have shrapn